#include <stdlib.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <stdio.h>
#include <netinet/in.h>
#include <signal.h>
#include <unistd.h>
int main()
{
	int server_sockfd, client_sockfd;
	int server_len, client_len;
	struct sockaddr_in server_address;
	struct sockaddr_in client_address;
	server_sockfd = socket(AF_INET, SOCK_STREAM, 0);
	server_address.sin_family = AF_INET;
	server_address.sin_addr.s_addr = htonl(INADDR_ANY);
	server_address.sin_port = htons(9734);
	server_len = sizeof(server_address);
	bind(server_sockfd, (struct sockaddr *)&server_address, server_len);
	listen(server_sockfd, 5);
	signal(SIGCHLD, SIG_IGN);
	while(1) 
	{
		char ch;
		printf("server waiting\n");
		client_len = sizeof(client_address);
		client_sockfd = accept(server_sockfd, (struct sockaddr *)&client_address, &client_len);
		if(fork() == 0) 
		{
			read(client_sockfd, &ch, 1);
			sleep(5);
			ch++;
			write(client_sockfd, &ch, 1);
			close(client_sockfd);
			exit(0);
		}
		else 
		{
			close(client_sockfd);
		}
	}
}
